// Read the database file and build the index
    //     While there are records in the database
    //         Read the record
    //         Insert the <account ID, record number> item in the index
    //         Increment the record number

    // TODO: Add your code to implement the algorithm here
	if (acctFile){
	  while(acctFile.good()){
        acctFile.seekg(recordNum*bytesPerRecord);
        acctFile >> acctRec.acctID >> acctRec.firstName
        >> acctRec.lastName >> acctRec.balance;

		index.insertItem(acctRec.acctID, recordNum);
		recordNum++;
	  }
	}
        else {
	cout << "File Cannot Be Opened!" << endl;
	}

// TODO: Add your code to implement the algorithm here
			cout << "Enter Account ID:";
			cin >> account;
            p = index.find(account);
			if(p.isNull())
			  cout << "This Account ID Does Not Exist" << endl;
			else{
			  account = p.key();
			  recordNum = p.element();
			  acctFile.seekg(recordNum*bytesPerRecord);
			  acctFile >> acctRec.acctID >> acctRec.firstName
               >> acctRec.lastName >> acctRec.balance;
		     cout << recordNum << ":" << acctRec.acctID << " " << acctRec.firstName
			  << " " << acctRec.lastName << ": $" << acctRec.balance << endl;
		}

    while(acctFile.good()){

      cout << "Seeking byte " << recordNum * bytesPerRecord << endl;

      acctFile.seekg(recordNum*bytesPerRecord);
      acctFile >> acctRec.acctID >> acctRec.firstName
      >> acctRec.lastName >> acctRec.balance;

      cout << "acctRec.acctID = " << acctRec.acctID << endl;
      if (!acctFile) {
        cout << "There is a problem with acctFile" << endl;
        break;// Or do something, maybe more drastic.
      }

      index.insertItem(acctRec.acctID, recordNum);
      recordNum++;
    }

    while(acctFile.good()){

      //cout << "Seeking byte " << recordNum * bytesPerRecord << endl;
      //acctFile.seekg(recordNum*bytesPerRecord);

      acctFile >> acctRec.acctID >> acctRec.firstName
      >> acctRec.lastName >> acctRec.balance;

      cout << "acctRec.acctID = " << acctRec.acctID << endl;
      if (!acctFile) { // end of file or error? Maybe do some checks here
        //cout << "There is a problem with acctFile" << endl;
        break;
      }     

      index.insertItem(acctRec.acctID, recordNum);
      recordNum++;
    }

  if (acctFile){
    while(acctFile.good()){
        //acctFile.seekg(recordNum*bytesPerRecord);
        acctFile >> acctRec.acctID >> acctRec.firstName
        >> acctRec.lastName >> acctRec.balance;
        if (!acctFile) {
          break;
        }
        cout << "acctRec.acctID = " << acctRec.acctID << endl;
        cout << "acctRec.firstName = " << acctRec.firstName << endl;
        cout << "acctRec.lastName = " << acctRec.lastName << endl;
        cout << "acctRec.balance = " << acctRec.balance << endl;
        cout << endl;

    index.insertItem(acctRec.acctID, recordNum);
    recordNum++;
    }

// ReadRecordSample.cpp
// Retrieves a record from an accounts database file.

#include <iostream>
#include <fstream>
using namespace std;

//--------------------------------------------------------------------
//
// Declarations specifying the accounts database
//
//--------------------------------------------------------------------
const int nameLength      = 11;   // Maximum number of characters in
                                  //   a name
const long bytesPerRecord = 37;   // Number of bytes used to store
                                  //   each record in the accounts
                                  //   database file

struct AccountRecord {
    int acctID;                   // Account identifier
    char firstName[nameLength],   // Name of account holder
         lastName[nameLength];
    double balance;               // Account balance
};

//--------------------------------------------------------------------

int main(){
    ifstream acctFile ("accounts.dat");   // Accounts database file
    AccountRecord acctRec;                // Account record
    long recNum;                          // User input record number

    //Get the record number to retrieve
    cout << "\nEnter record number: ";
    cin >> recNum;

    //Move to the corresponding record in the database file using seekg()
    acctFile.seekg(recNum*bytesPerRecord);

    //Read in the record
    acctFile >> acctRec.acctID >> acctRec.firstName
             >> acctRec.lastName >> acctRec.balance;

    //Display the record
    cout << recNum << " : " << acctRec.acctID << " "
         << acctRec.firstName << " " << acctRec.lastName << " "
         << acctRec.balance << endl;
}

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
  double x;

  cout << "Using default precision (six significant digits):" << endl;
  x = 12.34;
  cout << "  x = " << x << endl;

  x = 123.45;
  cout << "  x = " << x << endl;

  x = 1234.56;
  cout << "  x = " << x << endl;

  x = 12345.67;
  cout << "  x = " << x << endl;

  x = 123456.78;
  cout << "  x = " << x << endl;

  x = 1234567.89;
  cout << "  x = " << x << endl << endl;

  cout << "After setting precision for 10 significant digits:" << endl;
  cout << setprecision(10);

  x = 12.34;
  cout << "  x = " << x << endl;

  x = 123.45;
  cout << "  x = " << x << endl;

  x = 1234.56;
  cout << "  x = " << x << endl;

  x = 12345.67;
  cout << "  x = " << x << endl;

  x = 123456.78;
  cout << "  x = " << x << endl;

  x = 1234567.89;
  cout << "  x = " << x << endl;

  return 0;
}

const long bytesPerRecord = 38; 
.
.
.
    ifstream acctFile ("accounts.dat", ios::bin);
.
.
.
  if (acctFile){
    while(acctFile.good()){
        acctFile.seekg(recordNum*bytesPerRecord);
        acctFile >> acctRec.acctID >> acctRec.firstName
        >> acctRec.lastName >> acctRec.balance;
        if (!acctFile) {
          break;
        }
        cout << setprecision(10);
        cout << "acctRec.acctID = " << acctRec.acctID << endl;
        cout << "acctRec.firstName = " << acctRec.firstName << endl;
        cout << "acctRec.lastName = " << acctRec.lastName << endl;
        cout << "acctRec.balance = " << acctRec.balance << endl;
        cout << endl;

    index.insertItem(acctRec.acctID, recordNum);
    recordNum++;
    }
  }
.
.
.

// TODO: Add your code to implement the algorithm here
cout << "Enter Account ID:";
cin >> account;
p = index.find(account);
   if(p.isNull())  // wanting to modify this line to block alpha characters
     cout << "This Account ID Does Not Exist" << endl;
   else{
     account = p.key();
     recordNum = p.element();
     acctFile.seekg(recordNum*bytesPerRecord);
     acctFile >> acctRec.acctID >> acctRec.firstName
      >> acctRec.lastName >> acctRec.balance;

     cout << recordNum << ":" << acctRec.acctID << " " << acctRec.firstName
     << " " << acctRec.lastName << ": $" << acctRec.balance << endl;
		}

#include <iostream>

using namespace std;

int main()
{
  double x;

  while (1) {
    cout << "Enter an integer or floating point number (-1 to quit):  ";
    cin >> x;
    if (!cin) {
      cin.clear(); // You must do this before you do anything else with cin

      while (cin.get() != '\n') // now empty the stream input buffer
        ;                       // an "empty loop"

      cout << "Illegal entry." << endl << endl; // you could be more polite?
    }
    else if (x == -1.0) {
      break;
    }
    else {
      cout << "You entered " << x << endl << endl;
    }
  }
  cout << endl << "Bye for now. It's been fun." << endl;
  return 0;
}